Plz help... Installation on cPanel / WHM of SiteBuilder

Hi!
Whenever I try to install SiteBuilder on my CentOS 4.x Server, I receive the following error message:


N) Next page; P) Go back; Q) Cancel installing
Select action [N]: n
Preparing system for Plesk installation
===============================================================================

There are 0 packages, that are necessary for Plesk and which
were not found in your system.

There are 0 packages that are installed, but will be upgraded
for product installation...

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